Perimeter and Area of Triangles
LET'S START WITH PERIMETER!
*Remember that perimeter is the distance AROUND a shape!
*Follow the 4 steps to find the perimeter of a triangle:
*Follow the 4 steps to find the perimeter of a triangle:
- Plot your points on the coordinate plane
- Count the distance of the two legs.
- Use the Pythagorean Theorem to find the hypotenuse.
- Add all sides.
EXAMPLE
Find the PERIMETER of the triangle using the following coordinates:
A (-4, -3)
B (2, -3)
C (2, 5)
A (-4, -3)
B (2, -3)
C (2, 5)
NOW LET'S TAKE A LOOK AT AREA!
*Remember that area is the amount of space INSIDE a shape!
*Follow the 4 steps to find the area of a triangle:
*Follow the 4 steps to find the area of a triangle:
- Plot your points on the coordinate plane
- Count the distance of the two legs.
- Multiply the two distances.
- Divide by two.
*Remember that units will always be squared!
EXAMPLE
Find the AREA of the triangle using the following coordinates:
A (-4, -3)
B (2, -3)
C (2, 5)
A (-4, -3)
B (2, -3)
C (2, 5)
YOUR TURN!
Find the PERIMETER and the AREA of the triangle using the following coordinates:
A (0, 2)
B (4, 2)
C (4, -1)
A (0, 2)
B (4, 2)
C (4, -1)